I think murray's best surface is on the h/court,has a great serve,b/hand,love the way he can change the pace of the ball,has quick direction,but Nadal has proven he can handle Murray,what about his sheer briliance against Murray at Wimbledon,Nadal is so much more stronger,fitter,his mental ability is amazing,also Nadal makes adjustments during a game to beat his opposition.I say it will be closer than grass,Nadal is too strong at the moment for anyone.